debug :
    uart4 (115200 8 1) (初始化时需要swap rx-tx)
    pd00 
    pd01  

ext flash :
    xspi2 (w35t51nwie) (Octo SPI, Port2 Octo, NCS1-Port2) 64MB
    w35t51nwie cfg reg (0xff = Default for Extended SPI, Device ID: Configuration=00h)
    SPI Flash ID: ef 5b 1a 02 00 00
    EFh
    5Bh = 1.8V
    1Ah = 512Mb
    02h
    00h: Uniform 64KB Blocks
    00h: Extended SPI (SDR)
    
    PN1     ------> XSPIM_P2_NCS1
    PN3     ------> XSPIM_P2_IO1
    PN0     ------> XSPIM_P2_DQS0
    PN11     ------> XSPIM_P2_IO7
    PN10     ------> XSPIM_P2_IO6
    PN9     ------> XSPIM_P2_IO5
    PN2     ------> XSPIM_P2_IO0
    PN6     ------> XSPIM_P2_CLK
    PN8     ------> XSPIM_P2_IO4
    PN4     ------> XSPIM_P2_IO2
    PN5     ------> XSPIM_P2_IO3

keil flm :
    load addr 0x24000000, size 0xf000

xspi2 memory mapped:
    (0x70000000) mpu必须配置, 否则无法xip

    MPU_InitStruct.Enable = MPU_REGION_ENABLE;
    MPU_InitStruct.Number = MPU_REGION_NUMBER0;
    MPU_InitStruct.BaseAddress = 0x0;
    MPU_InitStruct.Size = MPU_REGION_SIZE_4GB;
    MPU_InitStruct.SubRegionDisable = 0x87;
    MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
    MPU_InitStruct.AccessPermission = MPU_REGION_NO_ACCESS;
    MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
    MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
    MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
    MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;

    HAL_MPU_ConfigRegion(&MPU_InitStruct);

    MPU_InitStruct.Enable = MPU_REGION_ENABLE;
    MPU_InitStruct.Number = MPU_REGION_NUMBER1;
    MPU_InitStruct.BaseAddress = 0x70000000;
    MPU_InitStruct.Size = MPU_REGION_SIZE_16MB;
    MPU_InitStruct.SubRegionDisable = 0x0;
    MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL1;
    MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
    MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_ENABLE;
    MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
    MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
    MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;

    HAL_MPU_ConfigRegion(&MPU_InitStruct);

psram :
    xspi1 (aps256xxn) (Hexa SPI, Port1 Hexa, NCS1-Port1)

    PO3     ------> XSPIM_P1_DQS1
    PP10     ------> XSPIM_P1_IO10
    PP12     ------> XSPIM_P1_IO12
    PP14     ------> XSPIM_P1_IO14
    PP2     ------> XSPIM_P1_IO2
    PP5     ------> XSPIM_P1_IO5
    PO2     ------> XSPIM_P1_DQS0
    PP1     ------> XSPIM_P1_IO1
    PP11     ------> XSPIM_P1_IO11
    PP15     ------> XSPIM_P1_IO15
    PP3     ------> XSPIM_P1_IO3
    PP0     ------> XSPIM_P1_IO0
    PP7     ------> XSPIM_P1_IO7
    PP8     ------> XSPIM_P1_IO8
    PP13     ------> XSPIM_P1_IO13
    PP4     ------> XSPIM_P1_IO4
    PO4     ------> XSPIM_P1_CLK
    PP6     ------> XSPIM_P1_IO6
    PO0     ------> XSPIM_P1_NCS1
    PP9     ------> XSPIM_P1_IO9

    aps256 在读取控制寄存器时，要按 0-1 2-3 4-8 一次读取两个寄存器的值， 
    1-2，3-4 读取的值依旧是 0-1，2-3
    地址按偶数，奇数地址读到的是 奇数地址-1 的值